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參數(shù)資料
| 型號(hào)： | ST7267C8T1/XXX |
| 廠商： | STMICROELECTRONICS |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, MROM, 30 MHz, RISC MICROCONTROLLER, PQFP48 |
| 封裝： | 7 X 7 MM, LEAD FREE, TQFP-48 |
| 文件頁(yè)數(shù)： | 180/189頁(yè) |
| 文件大?。?/td> | 1643K |
| 代理商： | ST7267C8T1/XXX |
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ST7267C8 ST7267R8
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10.4.8 Register Description
SPI CONTROL REGISTER (SPICR)
Read/Write
Reset Value: 0000 xxxx (0xh)
Bit 7 = SPIE Serial Peripheral Interrupt Enable
This bit is set and cleared by software.
0: Interrupt is inhibited
1: An SPI interrupt is generated whenever an End
of Transfer event, Master Mode Fault or Over-
run error occurs (SPIF = 1, MODF = 1 or
OVR = 1 in the SPICSR register)
Bit 6 = SPE Serial Peripheral Output Enable
This bit is set and cleared by software. It is also
cleared by hardware when, in master mode,
SS =0 (see Section 10.4.5.1 Master Mode Fault
(MODF)). The SPE bit is cleared by reset, so the
SPI peripheral is not initially connected to the ex-
ternal pins.
0: I/O pins free for general purpose I/O
1: SPI I/O pin alternate functions enabled
Bit 5 = SPR2 Divider Enable
This bit is set and cleared by software and is
cleared by reset. It is used with the SPR[1:0] bits to
set the baud rate. Refer to Table 27 SPI Master
0: Divider by 2 enabled
1: Divider by 2 disabled
Note: This bit has no effect in slave mode.
Bit 4 = MSTR Master Mode
This bit is set and cleared by software. It is also
cleared by hardware when, in master mode,
SS =0 (see Section 10.4.5.1 Master Mode Fault
0: Slave mode
1: Master mode. The function of the SCK pin
changes from an input to an output and the func-
tions of the MISO and MOSI pins are reversed.
Bit 3 = CPOL Clock Polarity
This bit is set and cleared by software. This bit de-
termines the idle state of the serial Clock. The
CPOL bit affects both the master and slave
modes.
0: SCK pin has a low level idle state
1: SCK pin has a high level idle state
Note: If CPOL is changed at the communication
byte boundaries, the SPI must be disabled by re-
setting the SPE bit.
Bit 2 = CPHA Clock Phase
This bit is set and cleared by software.
0: The first clock transition is the first data capture
edge.
1: The second clock transition is the first capture
edge.
Note: The slave must have the same CPOL and
CPHA settings as the master.
Bits 1:0 = SPR[1:0] Serial Clock Frequency
These bits are set and cleared by software. Used
with the SPR2 bit, they select the baud rate of the
SPI serial clock SCK output by the SPI in master
mode.
Note: These 2 bits have no effect in slave mode.
Table 27. SPI Master Mode SCK Frequency
70
SPIE
SPE
SPR2
MSTR CPOL
CPHA
SPR1
SPR0
Serial Clock
SPR2
SPR1
SPR0
fCPU/4
1
0
fCPU/8
0
fCPU/16
1
fCPU/32
1
0
fCPU/64
0
fCPU/128
1
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